Mechanical Synthesis of LiNi_0.5Mn_1.5O₄ Cathode Powders by Using Composite Precursor Particles

Abstract

The mechanical synthesis of a high-purity LiNi_0.5Mn_1.5O₄ cathode powder under ambient conditions is an important issue for a low-cost fabrication of lithium-ion batteries. In this paper, we have investigated the mechanical synthesis of LiNi_0.5Mn_1.5O₄ granules by using a Ni/Mn composite as a precursor to improve the cathode properties. The Ni/Mn composite powder, which was prepared by drying of MnO₂ in nickel nitrate solution, was used on mechanical treatment with Li₂CO₃. The LiNi_0.5Mn_1.5O₄ nanoparticles were synthesized by the mechanical method and granulated at the same time. The LiNi_0.5Mn_1.5O₄ granules did not contain any particles of starting materials. The LiNi_0.5Mn_1.5O₄ cathode prepared from this high-purity powder exhibited the improved discharge capacity at a high-voltage region of 4.7V.